有磁场时电子在航天器光电子鞘层中的漂移运动

ELECTRON DRIFT MOTION IN THESPACECRAFT PHOTO SHEATH OFMAGNETIZED PLASMA

采用二级漂移近似理论，研究了在航天器光电子鞘层中与电流收集有关的电于在磁场中的运动轨道和与收集电子有关的磁瓶结构．结果表明当磁场越强，航天器表面电势越弱，磁瓶在无穷远处横截面积就越小．在光电子鞘层中，势垒对电流收集影响较大，磁瓶的横截面积在略远于势垒处有极大值．磁瓶在无穷远处的横截面积并非随着势垒距航天器距离的远近而单调变化．

By using one second order drift approximation theory, we for the first time studythe drift motion of electrons in the photo sheath of spacecraft in a magnetizedplasma, and the structure of the magnetic bottle in the photo sheath. Resultsshow that the stronger the magnetic field, the weaker the electric potential of thespacecraft and the smaller the cross section of the magnetic bottle in the infinityis. In the photo sheath, the electric potential barrier has an important influence onthe current collection of the spacecraft.